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9 As A Factor By Karen Mastin Challenger Elementary.

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Presentation on theme: "9 As A Factor By Karen Mastin Challenger Elementary."— Presentation transcript:

1 9 As A Factor By Karen Mastin Challenger Elementary

2 Using Patterns to Find the Products When multiplying by 9, the tens digits in each product counts up by 1 and the ones digits counts back by 1. Scott Foresman----Addison Wesley

3 Examples TENSONES 1 X 9 = 2 X 9 = 3 X 9 = 4 X 9 = Scott Foresman----Addison Wesley

4 Use a Strategy to Multiply With 9 As a Factor This is the One Less = Nine Method: This is the One Less = Nine Method: Subtract one from the number you are multiplying by: 9 x 5, one less than 5 is 4. Subtract one from the number you are multiplying by: 9 x 5, one less than 5 is 4. The first number in the answer is 4. The two numbers that make up the answer will equal nine = 9. The last number in the answer is 5. 9 x 5 = 45. The first number in the answer is 4. The two numbers that make up the answer will equal nine = 9. The last number in the answer is 5. 9 x 5 = 45. multiplication.com

5 Use Your Fingers multiplication.com Your fingers represent the numbers 1-10 Insert graphic to demonstrate, from the following website.

6 multiplication.com Here is what 9 x 4 looks like. Fold over the finger representing the number you want to multiply nine by. (The finger representing four is curled under.) Insert graphic to demonstrate from website.

7 multiplication.com The first number in the answer the number of fingers before the curled under finger. (3) The second number is the number of fingers after the curled under finger. (6) 9 x 4 = 36 Insert graphic to demonstrate from website.

8 Conclusion Now you are ready to apply these strategies by completing activities in the computer lab.


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